US 12,227,602 B2
Polypropylene resin having excellent melt characteristics, and preparation method therefor
Su-Jeong Jeong, Daejeon (KR); Hyun-Yul Woo, Daejeon (KR); Joon-Keun Min, Daejeon (KR); Rai-Ha Lee, Suwon-si (KR); Eun-Hye Shin, Daejeon (KR); and Byung-Hun Chae, Daejeon (KR)
Assigned to LOTTE CHEMICAL CORPORATION, Seoul (KR)
Appl. No. 17/296,936
Filed by LOTTE CHEMICAL CORPORATION, Seoul (KR)
PCT Filed Nov. 27, 2019, PCT No. PCT/KR2019/016478
§ 371(c)(1), (2) Date May 25, 2021,
PCT Pub. No. WO2020/111777, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0150791 (KR), filed on Nov. 29, 2018.
Prior Publication US 2022/0025083 A1, Jan. 27, 2022
Int. Cl. C08F 210/06 (2006.01)
CPC C08F 210/06 (2013.01) [C08F 2420/00 (2013.01); C08F 2800/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of producing a high-melt-strength polypropylene resin, comprising following steps:
a) producing a polypropylene by polymerizing a propylene monomer in the presence of a metallocene catalyst; and
b) forming a long-chain branch having 40 or more carbon atoms in a main chain of the polypropylene by adding and reacting a diene compound and a comonomer to the produced polypropylene and an unreacted propylene monomer,
wherein the diene compound is added in an amount of 0.0001 to 5 parts by weight based on 100 parts by weight of the propylene monomer utilized in the step a),
wherein the comonomer is added in an amount of 0.1 to 4 parts by weight based on 100 parts by weight of the propylene monomer utilized in the step a), and
wherein the high-melt-strength polypropylene resin has a melt strength of 1 to 30 gf, measured utilizing an extensional viscosity fixture in an advanced rheometric expansion system (ARES) at 190° C. and with an extension rate of 0.1 s−1, and a maximum melt elongation time of 20 seconds or more.